Jason Scotland's long-range strike earned Ipswich a point as Palace drew their 11th home game of the season.
Ipswich were arguably the better side in the first half and they gave Eagles goalkeeper Julian Speroni plenty to do.
But Palace went ahead after Nathaniel Clyne linked well with Sean Scannell before delivering a cross for Chris Martin, who fired in from 12 yards.
The equaliser came just before the hour when Grant Leadbitter fed Scotland, whose shot skidded past Speroni.
As well as succumbing to another home draw Palace are now on a six-match winless run and it might have been worse had it not been for their goalkeeper Speroni.
After just three minutes Lee Martin's long-range drive was gathered uneasily by Speroni, who scampered across his goal moments later as Andy Drury's ambitious shot flew narrowly wide.
Leadbitter then arrowed a shot wide from 25 yards before Jay Emmanuel-Thomas stung Speroni's palms with a strike from even further out.
Speroni's one-man resistance continued in the 25th minute as Scotland's well-timed volley was parried to safety and then Emmanuel-Thomas was denied from distance.
Against the run of play, Chris Martin, who is on loan at Palace from Norwich, capitalised on the good work of Clyne and Scannell to put the home side into the lead.
After an even start to the second half it was Ipswich who made the first decisive move.
Leadbitter fed Scotland and he weighed up his options before unleashing a shot from outside the area that was too good for Speroni.
Aaron Cresswell saw a late shot blocked, while substitute Kyle De Silva went close for Palace.
Live Text Commentary
Full Time The final whistle goes and the game is over.90:00 +2:43
The official flags Michael Chopra offside. Julian Speroni restarts play with the free kick.90:00 +1:34
Shot from 30 yards from Carlos Edwards.90:00 +1:14
Andy Drury takes the inswinging corner, Patrick McCarthy makes a clearance.90:00 +1:02
Michael Chopra takes a shot. Blocked by Patrick McCarthy.89:45
Centre by Lee Martin, save by Julian Speroni.88:40
Kyle De Silva produces a left-footed shot from long range which goes wide right of the goal.88:18
Lee Martin sends in a cross, save by Julian Speroni.83:44 Substitution
Substitution Ryan Stevenson comes on in place of Jason Scotland.81:32
Owen Garvan restarts play with the free kick.81:32 Booking
Booking Damien Delaney booked.81:21
Free kick awarded for a foul by Damien Delaney on Kyle De Silva.80:14
Aaron Cresswell crosses the ball, clearance made by Patrick McCarthy.78:19
Centre by Aaron Cresswell, Stuart O'Keefe manages to make a clearance.77:14 Substitution
Substitution (Crystal Palace) makes a substitution, with Jonathan Parr coming on for Darren Ambrose.76:28
A cross is delivered by Daryl Murphy, Aaron Cresswell has an effort at goal from 20 yards. Blocked by Patrick McCarthy.75:55
The referee blows for offside. Carlos Edwards takes the direct free kick.74:49
The ball is sent over by Carlos Edwards, Header from deep inside the penalty area by Daryl Murphy goes harmlessly over the crossbar.74:20
Daryl Murphy sends in a cross.73:27 Substitution
Substitution Sean Scannell leaves the field to be replaced by Kyle De Silva.
Effort from the edge of the area by Sean Scannell goes wide of the right-hand upright.69:13
The ball is swung over by Lee Martin, clearance made by Patrick McCarthy.68:53
Outswinging corner taken right-footed by Andy Drury from the right by-line, clearance made by Paul McShane.68:32
Shot by Lee Martin. Blocked by Patrick McCarthy.68:11
Short corner worked by Lee Martin.67:28
Aaron Cresswell takes the direct free kick.67:28 Booking
Booking Nathaniel Clyne is shown a yellow card for unsporting behaviour.66:46
Free kick awarded for an unfair challenge on Jason Scotland by Nathaniel Clyne.65:36
Unfair challenge on Aaron Cresswell by Wilfried Zaha results in a free kick. Arran Lee-Barrett takes the direct free kick.63:48
Centre by Andy Drury, clearance by Patrick McCarthy.63:06
Chris Martin is caught offside. Damien Delaney takes the direct free kick.62:40
Darren Ambrose takes a shot. Comfortable save by Arran Lee-Barrett.60:13
The referee blows for offside against Michael Chopra. Julian Speroni restarts play with the free kick.58:46
Grant Leadbitter provided the assist for the goal.58:46 Goal scored
Goal! - Jason Scotland - C Palace 1 - 1 Ipswich Jason Scotland finds the net with a goal from just outside the penalty box to the bottom right corner of the goal. Crystal Palace 1-1 Ipswich.58:09 Booking
Booking Lee Martin is cautioned by the ref for dissent.57:40
Aaron Cresswell sends in a cross, Nathaniel Clyne gets a block in.56:36 Substitution
Substitution Jay Emmanuel-Thomas goes off and Michael Chopra comes on.52:50
Foul by Lee Martin on Wilfried Zaha, free kick awarded. Free kick crossed right-footed by Darren Ambrose from right wing, Arran Lee-Barrett makes a save.52:09
Daryl Murphy produces a cross, Dean Moxey makes a clearance.50:23
The referee blows for offside against Darren Ambrose. Indirect free kick taken by Arran Lee-Barrett.47:56
Sean Scannell takes a shot from just outside the penalty area clears the crossbar.45:43
A cross is delivered by Aaron Cresswell, clearance by Dean Moxey.45:30
A cross is delivered by Aaron Cresswell, Owen Garvan manages to make a clearance.45:16
A cross is delivered by Daryl Murphy, Nathaniel Clyne gets a block in.45:01
The match restarts for the second half.45:00 +2:59 Half time
Half Time The half-time whistle blows.45:00 +2:14
Effort on goal by Wilfried Zaha from just inside the penalty area goes harmlessly over the target.45:00 +1:33
The ball is delivered by Daryl Murphy.45:00 +0:29
Carlos Edwards produces a right-footed shot from deep inside the penalty box which goes wide of the left-hand post.44:53
The ball is sent over by Wilfried Zaha.43:47
The ball is sent over by Jay Emmanuel-Thomas, clearance by Patrick McCarthy.41:11
Aaron Cresswell sends in a cross.37:29
Arran Lee-Barrett takes the direct free kick.37:29 Booking
Booking Stuart O'Keefe is shown a yellow card.37:10
Free kick awarded for a foul by Stuart O'Keefe on Andy Drury.35:53
Assist by Nathaniel Clyne.35:53 Goal scored
Goal! - Chris Martin - C Palace 1 - 0 Ipswich Chris Martin finds the back of the net with a goal from inside the penalty area low into the middle of the goal. Crystal Palace 1-0 Ipswich.34:29
Foul by Grant Leadbitter on Stuart O'Keefe, free kick awarded. Dean Moxey takes the free kick.33:51 Substitution
Substitution Kagisho Dikgacoi goes off and Owen Garvan comes on.31:50
Daryl Murphy crosses the ball, Dean Moxey manages to make a clearance.31:18
Centre by Darren Ambrose, Arran Lee-Barrett manages to make a clearance.30:38
Effort from the edge of the area by Jason Scotland goes wide of the right-hand upright.26:52
Jay Emmanuel-Thomas takes the chance to get an effort at goal. Julian Speroni makes a save.25:12
Jason Scotland takes the chance to get an effort at goal. Save made by Julian Speroni.24:39
Lee Martin takes a shot. Patrick McCarthy gets a block in.23:58
Lee Martin has an effort at goal from outside the box which goes wide right of the target.23:40
Free kick awarded for a foul by Wilfried Zaha on Grant Leadbitter. Carlos Edwards takes the free kick.23:24 Booking
Booking Tommy Smith is booked.22:54
Darren Ambrose takes a shot. Save by Arran Lee-Barrett.21:46
Tommy Smith concedes a free kick for a foul on Chris Martin. Free kick crossed by Darren Ambrose, clearance by Damien Delaney.20:02
Daryl Murphy delivers the ball.19:26
Lee Martin fouled by Kagisho Dikgacoi, the ref awards a free kick. Grant Leadbitter takes the free kick.18:47
Shot by Jay Emmanuel-Thomas from 30 yards. Save by Julian Speroni.18:10
Shot from just outside the area by Darren Ambrose goes over the bar.17:15
Effort from outside the penalty box by Grant Leadbitter goes wide right of the goal.16:23
The referee penalises Kagisho Dikgacoi for handball. Andy Drury takes the direct free kick.16:06
The ball is delivered by Grant Leadbitter, clearance made by Nathaniel Clyne.15:25
Kagisho Dikgacoi gives away a free kick for an unfair challenge on Andy Drury. Free kick taken by Tommy Smith.14:33
Aaron Cresswell produces a cross.12:52
Centre by Carlos Edwards, clearance made by Dean Moxey.12:20
The ball is crossed by Stuart O'Keefe, Arran Lee-Barrett makes a save.10:32
The assistant referee signals for offside against Darren Ambrose. Grant Leadbitter takes the free kick.8:20
The ball is sent over by Daryl Murphy.4:43
Effort from outside the box by Andy Drury goes wide right of the target.4:10
Jay Emmanuel-Thomas delivers the ball, Nathaniel Clyne manages to make a clearance.3:56
The referee gives a free kick against Dean Moxey for handball. Direct free kick taken by Carlos Edwards.3:04
Lee Martin has a drilled shot. Save by Julian Speroni.1:44
Lee Martin crosses the ball.0:00
The game kicks-off.
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